K frame ID

Haha, sounds familiar!

When I bought my ‘74 Duster the intent was to leave it a /6 auto car and just have something to drive while I did a full tear down and some rust repair on my ‘72 Challenger. But the /6 turned out to only have compression in 5 cylinders so it got yanked immediately. I ran it with a 318 I bought for a couple hundred bucks in front of a 904 for a bit. But then the Challenger turned into a major project with floors and frame rails and quarters so I put the 340 that was gonna go into it into the Duster with a 4 speed. Which I later upgraded to a T56. Just kept going, definitely had some mission creep. My whole build thread is in the link in my signature.

Good luck with yours!